Logical ReasoningDifficulty: Easy

PT2 S4 Q20 Explanation

Normal full-term babies are all born

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsParallel

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Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Normal full-term babies are all born with certain instinctive reflexes that disappear by the age of two months. Because this three-month-old baby exhibits these not a normal full-term baby.

What this question is testing

Parallel

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
20.

Which one of the following has a logical structure most like that of

Answer choices

  1. Trap7% picked this

    Because carbon dioxide turns limewater milky and this gas is oxygen, it will not

  2. Trap2% picked this

    Because no ape can talk and Suzy is an ape, Suzy

  3. Trap2% picked this

    Because humans are social animals and Henry is sociable, Henry

  4. Correct82% picked this

    Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is

    Why this is right

    Answer D is correct.

    Skill tested: Parallel · how this choice captures the argument's function is the move to repeat next time.

  5. Trap8% picked this

    Because some types of trees shed their leaves annually and this tree has not shed its leaves,

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